120A 12V/24V/48V Automatic over-current DC circuit breaker / switch
120A 12V/24V/48V Automatic over-current DC circuit breaker / switch
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120A 12V/24V/48V Automatic Over-Current DC Circuit Breaker / Switch
Resettable Fuse & Manual Isolator | IP67 Rated | Multi-Voltage DC Systems
The Photonicuniverse 120A Automatic Over-Current DC Circuit Breaker/Switch is an essential component for safeguarding your DC electrical systems. This versatile unit combines the critical functions of a resettable 120A fuse with a convenient On/Off switch, providing both robust over-current protection and manual circuit isolation in a single device.
Designed for a broad range of DC system voltages from 12V to 48V, this circuit breaker offers superior protection against high power draw, short-circuits, wiring errors, equipment faults, and other high-current events. Its resettable nature eliminates the need for fuse replacement, making it a practical and cost-effective alternative for various applications, from solar installations to marine and automotive setups.
KEY FUNCTIONALITY: Acts as a resettable fuse and a manual ON/OFF isolator switch for 12V, 24V, and 48V DC systems.
Key Features
| ▶ Dual Functionality — Combines over-current protection with a manual ON/OFF switch. |
| ▶ Resettable Design — Eliminates the need for fuse replacement after an over-current event. |
| ▶ Wide Voltage Range — Compatible with 12V, 24V, and 48V DC electrical systems. |
| ▶ Robust Construction — Made from UL94V-0 rated thermal plastic for high temperature resistance. |
| ▶ Water & Ignition Protected — IP67 rated and meets S.A.E. J1625, J1171, UL1500 international standards. |
| ▶ Surface Mountable — Designed for straightforward installation in various DC applications. |
Technical Specifications
| Parameter | Value |
|---|---|
| Rating | 120A |
| Voltage Compatibility | 12V / 24V / 48V DC |
| Protection Type | Thermal Overcurrent |
| Material | Thermal Plastic (UL94V-0) |
| Operating Temperature | -32°C to 82°C |
| Storage Temperature | -34°C to 149°C |
| Terminals Size | M6 |
| Enclosure Rating | IP67 |
| Dimensions (L x W x H) | 74 x 48 x 37 mm |
| Weight | 110g |
| International Standards | S.A.E. J1625, J1171, UL1500 |
Operating & Protection Details
This 120A DC circuit breaker provides essential protection for your electrical components by automatically tripping when an over-current condition is detected. This safeguards connected devices and wiring from damage due to excessive current draw, short-circuits, or system faults. Unlike traditional fuses, the breaker can be manually reset after the fault is cleared, restoring power without the need for replacement parts.
Beyond its protective function, the integrated manual switch allows for convenient isolation of the circuit. This is particularly useful for maintenance, troubleshooting, or when you need to safely disconnect a load from the power source without physically removing wires. Its robust thermal plastic construction and high IP67 rating ensure reliable performance in demanding environments.
Typical Applications
| Application | Description |
|---|---|
| Solar & Wind Systems | Connecting solar or wind charge controllers to battery banks, or between off-grid inverter DC inputs and batteries. |
| DC Power Distribution | Protecting main DC power distribution circuits or individual charging circuits. |
| Automotive Applications | Ideal for protecting high-current accessories, audio systems, or auxiliary battery circuits in vehicles. |
| Marine Environments | Suitable for boats and marine vessels due to its water-resistant and ignition-protected design. |
Built-In Protection Functions
This DC circuit breaker is engineered to provide comprehensive protection for your electrical system. It offers automatic thermal overcurrent protection against high power draw • short-circuits • wiring mistakes • and equipment faults. The unit is constructed from UL94V-0 rated thermal plastic for enhanced fire safety and features an IP67 enclosure for dust-tight and water immersion protection. Furthermore, it meets international standards S.A.E. J1625, J1171, and UL1500 for ignition protection, making it suitable for demanding environments such as marine applications.
Common Questions
What is the main advantage of a resettable circuit breaker over a fuse?
The primary advantage is convenience and cost-effectiveness. When an over-current event occurs, a traditional fuse blows and needs to be replaced. A resettable circuit breaker, however, can simply be reset (like flipping a switch) once the fault has been cleared, allowing the system to resume operation without needing spare parts.
Can this circuit breaker be used as a manual ON/OFF switch?
Yes, absolutely. In addition to its automatic over-current protection, this unit features a manual break option, allowing it to function as a reliable ON/OFF isolator switch for easy disconnection and reconnection of your DC system.
Is this circuit breaker suitable for outdoor or marine use?
Yes, its IP67 rating confirms it is dust-tight and protected against temporary immersion in water. Combined with its compliance with S.A.E. J1625, J1171, and UL1500 standards for ignition protection, it is well-suited for demanding outdoor and marine environments where exposure to elements is a concern.
What does UL94V-0 rated thermal plastic mean?
UL94V-0 is a flammability rating for plastic materials. A V-0 rating indicates that the material stops burning within 10 seconds on a vertical specimen, and flaming drips are permitted as long as they are not inflamed. This signifies a high level of fire resistance for the enclosure material.
Installation Notes
- Ensure the circuit breaker is installed by a qualified professional if you are unsure.
- This unit is designed for surface mounting.
- Always disconnect power before installing or servicing any electrical components.
- Verify correct polarity when connecting to your DC system.
- Use appropriate M6 terminals and ensure secure, tight connections to prevent resistance and heat build-up.
- Mount in a location that allows for easy access for manual operation and inspection.
Before You Buy
- System Voltage: Confirm your DC system operates within the 12V-48V range.
- Current Rating: Ensure the 120A rating matches or exceeds the maximum continuous current draw of the circuit it will protect.
- Terminal Size: Verify that M6 terminals are compatible with your existing wiring and connectors.
- Application Suitability: Consider the specific environment (e.g., marine, off-grid, automotive) to ensure full compliance with local regulations and safety standards.
- Mounting: This is a surface-mount device; ensure you have suitable space for installation.
Always verify product specifications and compatibility with your specific system requirements before purchase and installation. Consult a qualified electrician for complex installations.
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